204 MICROSCOPIC FUNGI. 



yellowish ; sori minute, crowded into orbicular patches ; spores 

 brown-black, obovate-oblong, frequently constricted, with the 

 upper joint globose. — On the under surface of the leaves of various 

 species of Polygonum. Autumn. Common. The Uredo spores 

 of this species are Trichobdsis Polygonorum. 



Puccinia vaginaliuni, Lk. Knotgrass Brand ; spots 

 none; sori hypogenous, subrotund or oblong, at first surrounded 

 by the ruptured epidermis; spores brown, obtusely ovate ; 

 pedicels long, filiform. — On leaves and stems of Knotgrass, Poly- 

 gonum aviculare. Autumn. I have never been able to fnsd a 

 Puccinia on Polygonum aviculare, and suspect that only the 

 Uromyces occurs with us. 



Puccinia Amphibii, Pckl. Sori at first tuberculate, 

 black, then splitting the cuticle, compact; pseudo-spores oblong- 

 clavate, constricted in the middle, stem short. — On leaves of 

 Polygonum amphibium. 



Puccinia Bistorts, DC. Spots none • sori scattered, 

 minute, numerous, rufous, hypophyllous, suboroicular; pseudo- 

 spores ovoid or oblomr, obtuse, rounded, bright- brown, stem very 

 short.— On leaves of Polygonum viviparum and P. Bistorta. 



Puccinia Thesii, Chaill. Bastard-Toadflax Brand ; 

 cauline and amphigenous ; sori blackish-brown, small, roundish 

 or oblong, convex, scattered or aggregate, surrounded by the 

 ruptured epidermis; spores ovate, obtuse, scarcely constricted; 

 pedicels elongated. — On Thesium humifusum, in company with 

 jEcid'mm Thesii. 



Puccinia Primulse, Grev. Primrose Brand ; hypogenous 

 deep brown, solitary, scattered, or concentric and subconfluent 

 spores obovate-oblong, slightly constricted. — On Primrose leaves 

 Not common. 



Puccinia Veronicarum, DC. Veronica Brand ; spot 

 yellowish; sori subglobose, aggregate, or circinating, central on 

 large ; spores brown, obovate-oblong, more or less constricted. — 

 On the under surface of the leaves of several species of Veronica 

 Not common. 



Puccinia Glechomatis, DC. Ground-Iv? Brand; spots 

 brownish; sori subrotund, scattered, hypogenous ; spots brown, 

 rather short, subelliptic, scarcely at all constricted.— On leaves of 

 Ground Ivy, Glechoma hederacea. September and October. Not 

 uncommon". (Plate IV. figs. 73, 74.) 



Puccinia Menthse, Pers. Mint Brand ; spots obliterated 



